[PATCH v3 20/21] docs: devel: emmc: Add a doc for emmc card emulation

[Sai Pavan Boddu]

Add few simple steps to create emmc card with boot and user data
partitions.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
---
 docs/devel/emmc.txt | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 docs/devel/emmc.txt

diff --git a/docs/devel/emmc.txt b/docs/devel/emmc.txt
new file mode 100644
index 0000000..2d098fe
--- /dev/null
+++ b/docs/devel/emmc.txt
@@ -0,0 +1,16 @@
+====================
+eMMC block emulation
+====================
+
+Any eMMC devices has 3 kinds of partitions Boot, RPMB and User data. We
+are supporting Boot and User data partitions. Boot area partitions are
+expected to be 1MB size as hard coded in EXT_CSD register.
+
+Below is the example of combining two 1MB bootarea partition and
+user data partitions.
+
+      cat mmc-bootarea0.bin mmc-bootarea1.bin  image.wic > mmc.img
+      qemu-img resize mmc.img 4G
+
+Note: mmc-bootarea0/1 are just raw paritions. User data can have
+partition tables.
-- 
2.7.4